Komatsu PC200-8M0, Shop Manual

Page: 166 / 1254

SEN06120-00
10-402
24
PC200, 200LC, 220, 220LC-8M0
402 Hydraulic system, Part 2
Functions and operation by valve
When compensated
(When the load pressure is lower than other work equipment during a combined operation)
Function
q The pressure compensation valve closes by
the LS pressure of port (D), and the spool
meter-in downstream pressure of port (B)
becomes equivalent to the maximum pressure
of other work equipment.
q
Since the spool meter-in upstream pressure of
port (A) is the pump pressure, the spool meter-
in differential pressure [upstream pressure port
(A) pressure] - downstream pressure [port (B)
pressure] becomes equivalent to all the spools
in operation.
q
Pump flow is divided according to the ratio of
the meter-in opening areas.
Operation
q Spring chamber (E) is interconnected to port
(D).
q Piston (4) and valve (2) are moved in the clos-
ing direction (to the right) by the LS circuit
pressure of port (F) from other work equip-
ment.
q Valve upstream pressure (= spool meter-in
downstream pressure) of port (B) is controlled
with the LS pressure.